As far as I’ve found out, there are no UI features available out-of-the-box to use these services, so I’ve decided to create some. The first one is a custom workflow action you can use in SharePoint Designer to convert a document to many of the supported
formats.

In the workflow designer you can add the “Convert Document” action:

The action is inserted into the workflow step where you can specify the url of the output file, select the output format and save options and select a variable for storing the conversion job id (which you can use later to retrieve the status, as the job runs asynchronous):

The job id is also logged into the Workflow History Log (the second entry is from a second workflow action that logs the returned conversion job id variable):

After the job has run, which can take up to a few minutes (depending on the word automation services settings), the converted document appears in the library:

The custom workflow action is one of the first features for Word Automation in SharePoint 2010 I’ve planned to release. Other features will be a Ribbon and Item context menu extension and more Workflow actions.

Let me know if you have any suggestions for improvement or other functionality you would like to see.